1,3,5-triazine derivative and method of using same

ABSTRACT

Disclosed are compounds having formulae I and II or pharmaceutically acceptable salts or hydrates thereof, a preparation method thereof and pharmaceutical compositions thereof. The compounds having formulae I and II possesses an isocitrate dehydrogenase 2 (IDH2) inhibitory activity and are capable of treating IDH2 mutation-induced cancers.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Phase application of PCT/CN2016/092254, filed Jul. 29, 2016, which claims the benefit of Chinese Invention Patent Application No. 201510459126.X filed at the State Intellectual Property Office of the People's Republic of China on Jul. 30, 2015, the entire content of which is incorporated herein by reference.

TECHNICAL FIELD

The present application relates to the pharmaceutical field, and more specifically to a 1,3,5-triazine derivative and a method of using the same.

BACKGROUND

As the most important key enzyme in intracellular tricarboxylic acid cycle, IDH (full name: isocitrate dehydrogenase) can catalyze oxidative decarboxylation of isocitric acid to 2-oxoglutarate (i.e., α-ketoglutaric acid). Researches have shown that many tumors (such as, glioma, sarcoma, and acute myelocytic leukemia) have an IDH mutation at arginine residue in a catalytic center (IDH1/R132H, IDH2/R140Q, and IDH2/R172K). The mutated IDH acquires a new ability to catalyze the conversion of α-ketoglutaric acid (α-KG) to 2-hydroxyglutaric acid (2-HG). Researches have shown that the structure of α-ketoglutaric acid is similar to that of 2-hydroxyglutaric acid, and 2-HG competes with α-KG, thereby reducing the activity of α-KG-dependent enzymes, and resulting in a high methylation of chromatin. Such supermethylation is considered to interfere with a normal cell differentiation, and lead to an excessive proliferation of immature cells, thereby resulting in cancers.

In 2013, Agios Pharmaceuticals reported an IDH2/R140Q inhibitor AGI-6780 (Science. 2013, 340, 622-626) and an IDH1/R132H inhibitor AGI-5198 (Science. 2013, 340, 626-630), and WO2015017821 disclosed another IDH2/R140Q inhibitor AG-221. AGI-6780 and AGI-5198 can inhibit the generation of 2-HG in cells carrying the most common IDH2 mutant and the most common IDH1 mutant, respectively. These molecules not only inhibit the generation of 2-HG, but also induce the differentiation of abnormally proliferated human cancer cells in a culture. The treatment of leukemia cells carrying the IDH2 mutant with AGI-6780, and the treatment of glioma cells carrying the IDH1 mutant with AGI-5198 both result in an enhanced expression of mature markers in these cells. Moreover, researchers have found that AGI-5198 can inhibit the growth rate of the glioma cells either by the treatment of cell cultures with AGI-5198 or by oral administration of AGI-5198 to mice with a transplanted tumor.

SUMMARY

In an aspect, the present application provides a compound of formula I:

wherein:

ring A is selected from a benzene ring or a 5- or 6-membered heteroaromatic ring containing 1 or 2 heteroatoms selected from the group consisting of N, O and S;

X₁ is selected from NH or O;

R₁ is selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃₋₆ cycloalkyl, wherein the alkyl, the alkenyl, the alkynyl or the cycloalkyl may be optionally substituted with one or more R₆;

R₂ is selected from the group consisting of phenyl, 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, benzyl, C₁₋₆ alkyl, C₁₋₆ alkoxy and C₃₋₆ cycloalkyl, and may be optionally substituted with one or more R₇;

each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

R₄ and R₅ are independently selected from the group consisting of hydrogen, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈;

each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl; and

n is 0, 1, 2 or 3;

or a pharmaceutically acceptable salt or hydrate thereof.

In an another aspect, the present application provides a compound of formula II:

wherein:

X₁ is selected from NH or O;

X₂ is selected from N or CH;

R₁ is selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃₋₆ cycloalkyl, wherein the alkyl, the alkenyl, the alkynyl or the cycloalkyl may be optionally substituted with one or more R₆;

R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, C₁₋₆ alkyl, C₁₋₆ alkoxy and C₃₋₆ cycloalkyl, and may be optionally substituted with one or more R₇;

each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, CF₃, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈;

each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl; and

n is 0, 1, 2 or 3;

or a pharmaceutically acceptable salt or hydrate thereof.

In yet another aspect, the present application provides a pharmaceutical composition, which comprises a therapeutically effective amount of a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, and one or more pharmaceutically acceptable carriers or excipients.

In yet another aspect, the present application provides a method for treating IDH2 mutation-induced cancers, comprising administering to a subject in need thereof a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, or a pharmaceutical composition thereof.

In yet another aspect, the present application provides a use of a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, or a pharmaceutical composition thereof, in the preparation of a medicament for treating IDH2 mutation-induced cancers.

In yet another aspect, the present application provides a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, or a pharmaceutical composition thereof, for use in the treatment of IDH2 mutation-induced cancers.

In some embodiments of the present application, the IDH2 mutation is an IDH2/R140Q mutation or an IDH2/R172K mutation.

DETAILED DESCRIPTION

In the following description, certain specific details are included to provide a thorough understanding of various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details, or with other methods, components, materials, and the like.

Unless the context requires otherwise, throughout the specification and claims which follow, the term “comprise” and English variations thereof, such as “comprises” and “comprising”, are to be construed in an open and inclusive sense, that is as, “including, but not limited to”.

Reference throughout this specification to “one embodiment”, or “an embodiment”, or “another embodiment”, or “some embodiments” means that a particular referent element, structure, or characteristics described in connection with the embodiment is included in at least one embodiment. Accordingly, the appearances of the phase “in one embodiment”, or “in an embodiment”, or “in another embodiment”, or “in some embodiments” in various places throughout this specification are not necessarily all referring to the same embodiment. In addition, the particular elements, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

It should be noted that, as used in this specification and the appended claims, the singular forms “a”, “an” and “the” include plural referents unless the content clearly dictates otherwise. Thus, for example, reference to a reaction in which “a catalyst” is involved includes a single catalyst, or two or more catalysts. Unless otherwise explicitly specified herein, it should also be noted that the term “or” is generally employed in its sense including “and/or” unless the content clearly dictates otherwise.

Definitions

Unless stated otherwise, the following terms and phrases used herein have the following meanings. A specific term or phrase shall not be considered unclear or indefinite when it is not specially defined. It should be understood according to its general meaning. A trade name used herein refers to a corresponding product or an active ingredient thereof.

The term “optional” or “optionally” means that the subsequently described event or circumstance may or may not occur, and that the description includes instances where said event or circumstance occurs and instances where said event or circumstance does not occurs. For example, the expression that ethyl is “optionally” substituted with halogen means that the ethyl may be unsubstituted (CH₂CH₃), mono-substituted (such as, CH₂CH₂F), poly-substituted (such as, CHFCH₂F, CH₂CHF₂, and so on) or fully substituted (CF₂CF₃). A person skilled in the art will understand that in respect to any group containing one or more substituents, any substitution or substitution mode that is spatially impossible and/or not synthesizable will not be introduced.

The expression C_(m-n) used herein means that this moiety has m-n carbon atoms. For example, “C₃₋₁₀ cycloalkyl” means that said cycloalkyl has 3 to 10 carbon atoms. “C₀₋₆ alkylene” means that said alkylene has 0 to 6 carbon atoms, and the alkylene is a chemical bond when the group has 0 carbon atom.

A numerical range herein refers to each of the integers within this given range. For example, “C₁₋₁₀” means that a group may have 1 carbon atom, 2 carbon atoms, 3 carbon atoms, 4 carbon atoms, 5 carbon atoms, 6 carbon atoms, 7 carbon atoms, 8 carbon atoms, 9 carbon atoms or 10 carbon atoms.

The term “substituted” means that one or more hydrogen atoms on a given atom are replaced with a substituent, provided that the given atom has a normal valence state and the compound after substitution is stable. When the substituent is a keto (i.e., ═O), which means that two hydrogen atoms are replaced, the keto substitution will not occur on an aromatic group.

When any variant (such as, R) occurs more than one times at the composition or structure of a compound, it is defined independently in each case. Therefore, for example, if a group is substituted with 0 to 2R, then the group may be optionally substituted with at most two R, and R has an independent option in each case. Furthermore, a combination of substituents and/or variants thereof is allowed only if such combination will result in a stable compound.

Unless stated otherwise, the term “hetero” means a heteroatom or a heteroatom group (i.e., a group containing a heteroatom), i.e., atoms except for carbon and hydrogen atoms or an atom group containing such atoms. A heteroatom is independently selected from the group consisting of oxygen, nitrogen, sulfur, phosphorus, silicon, germanium, aluminum and boron. In an embodiment where two or more heteroatoms are involved, the two or more heteroatoms may be identical, or parts or all of the two or more heteroatoms may be different.

The term “halogen” or “halo” refers to any group of fluoro, chloro, bromo and iodo.

The term “hydroxy” refers to —OH.

The term “cyano” refers to —CN.

The term “amino” refers to —NH₂, —NH(alkyl) and —N(alkyl)₂, and specific examples of an amino include, but are not limited to, —NH₂, —NHCH₃, —NHCH(CH₃)₂, —N(CH₃)₂, —NHC₂H₅, —N(CH₃)C₂H₅, and the like.

The term “alkyl” refers to a straight or branched chain saturated aliphatic hydrocarbon group consisting of carbon atoms and hydrogen atoms, such as, methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, and decyl. The specific alkyl includes all isomers thereof. For example, propyl includes —CH₂CH₂CH₃ and —CH(CH₃)₂. For example, butyl includes —CH₂CH₂CH₂CH₃, —CH(CH₃)(CH₂CH₃), —C(CH₃)₃ and —CH₂CH(CH₃)₂. The term “C₁₋₈ alkyl” refers to an alkyl having 1 to 8 carbon atoms. The term “C₁₋₆ alkyl” refers to an alkyl having 1 to 6 carbon atoms. The term “C₁₋₄ alkyl” refers to an alkyl having 1 to 4 carbon atoms. The term “C₁₋₃ alkyl” refers to an alkyl having 1 to 3 carbon atoms. The “alkyl”, “C₁₋₈ alkyl”, “C₁₋₆ alkyl”, “C₁₋₄ alkyl” and “C₁₋₃ alkyl” may be unsubstituted or substituted with one or more substituents selected from the group consisting of hydroxy, halogen and amino.

The term “alkenyl” refers to a straight or branched chain aliphatic hydrocarbon group containing 2 to 12 carbon atoms and having one or more double bonds. Examples of the alkenyl include, but are not limited to, ethenyl, allyl, propenyl, 2-butenyl and 3-hexenyl. One of the double-bonded carbon atoms may be optionally an attachment site of an alkenyl substituent.

The term “alkynyl” refers to a straight or branched chain aliphatic hydrocarbon group containing 2 to 12 carbon atoms and having one or more triple bonds. Examples of the alkynyl include, but are not limited to, ethynyl, propargyl and 3-hexynyl. One of the triple-bonded carbon atoms may be optionally an attachment site of an alkynyl substituent.

The term “cycloalkyl” refers to a monocyclic saturated aliphatic hydrocarbon group consisting solely of carbon atoms and hydrogen atoms, such as, C₃₋₂₀ cycloalkyl, preferably C₃₋₆ cycloalkyl, such as, cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl. The cycloalkyl may be unsubstituted or substituted, and the substituent includes, but is not limited to, alkyl, alkoxy, cyano, carboxy, aryl, heteroaryl, amino, halogen, sulfonyl, sulfinyl, phosphoryl, hydroxy, and the like.

The term “alkoxy” refers to —O-alkyl group.

The term “heteroaromatic ring” refers to a monocyclic or fused ring having 5 to 12 ring atoms, such as, 5, 6, 7, 8, 9, 10, 11 or 12 ring atoms, wherein 1, 2, 3 or 4 ring atoms are selected from the group consisting of N, O and S, and the rest of ring atom(s) is(are) carbon atom(s), and the ring has a fully conjugated pi-electron system.

The term “heteroaryl” refers to a remaining group after one hydrogen atom is removed from a “heteroaramatic ring” molecule. The heteroaryl may be unsubstituted or substituted, and the substituent includes, but is not limited to, alkyl, alkoxy, aryl, aralkyl, amino, halogen, hydroxy, cyano, nitro, carbonyl, heteroalicyclic group, and the like. Non-limiting examples of unsubstituted heteroaryl include, but are not limited to, pyrrolyl, furyl, thienyl, pyrazolyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, isothiazolyl, oxadiazolyl, thiadiazolyl, indolyl, benzofuryl, benzothienyl, benzoxazolyl, benzothiazolyl, benzoimidazolyl, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, quinolyl, isoquinolyl, triazolyl, tetrazolyl, triazinyl, pteridinyl, etc.

The term “pharmaceutically acceptable” refers to a compound, material, composition and/or dosage form that is applicable to the contact with human and animal tissues without an excessive toxicity, irritation, allergic reaction or other problems or complications in the scope of reliable medical judgment, and is commensurate with an acceptable benefits/risk ratio.

The term “pharmaceutical acceptable carrier” refers to those carriers which do not cause significant stimulation to an organism, and will not impair the bioactivity and properties of an active compound. The “pharmaceutical acceptable carrier” also refers to an inert substance which is administered together with an active ingredient and is beneficial to the administration thereof, including, but not limited to, any glidants, sweetening agents, diluents, preservatives, dyes/colorants, flavoring agents, surfactants, wetting agents, dispersants, disintegrants, suspending agents, stabilizers, isotonic agents, solvents and emulsifiers, which have been approved by the States Food and Drug Administration as being acceptable for use in humans or animals (such as livestock). Non-limiting examples of said carrier include calcium carbonate, calcium phosphate, various sugars and starches, cellulose derivatives, gelatine, vegetable oils and polyethylene glycols. Other information about the carrier may be found in Remington: The Science and Practice of Pharmacy, 21st Ed., Lippincott, Williams & Wilkins (2005), the contents of which are incorporated herein by reference.

The term “excipient” generally refers to a carrier, a diluent and/or a medium used to formulate an effective pharmaceutical composition.

As for a medicament or pharmacologically active agent, the term “effective amount” or “therapeutically effective amount” refers to the amount of a medicament or agent that is not toxic but sufficient to achieve a desired effect. For an oral dosage form in the present application, the “effective amount” of an active substance in a pharmaceutical composition refers to the amount that is required to achieve a desired effect in combination with another active substance in the composition. The effective amount may be determined individually, depending on the age and general condition of a subject as well as a specific active substance. An appropriate effective amount in a specific case may be determined by a person skilled in the art through a routine test.

The term “active ingredient”, “therapeutic agent”, “active substance” or “active agent” refers to a chemical entity that can effectively treat target disorders, diseases or conditions.

The term “patient” or “subject” includes a human and an animal, such as a mammal (such as a primate, cow, horse, pig, dog, cat, mouse, rat, rabbit, goat, sheep, poultry, and so on).

A Compound of General Formulae

In an aspect, the present application provides a compound of formula I:

wherein:

ring A is selected from a benzene ring or a 5- or 6-membered heteroaromatic ring containing 1 or 2 heteroatoms selected from the group consisting of N, O and S;

X₁ is selected from NH or O;

R₁ is selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃₋₆ cycloalkyl, wherein the alkyl, the alkenyl, the alkynyl or the cycloalkyl may be optionally substituted with one or more R₆;

R₂ is selected from the group consisting of phenyl, 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, benzyl, C₁₋₆ alkyl, C₁₋₆ alkoxy and C₃₋₆ cycloalkyl, and may be optionally substituted with one or more R₇;

each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

R₄ and R₅ are independently selected from the group consisting of hydrogen, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈;

each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl; and

n is 0, 1, 2 or 3;

or a pharmaceutically acceptable salt or hydrate thereof.

In an embodiment of the present application, a compound of formula II is provided:

wherein:

X₁ is selected from NH or O;

X₂ is selected from N or CH;

R₁ is selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃₋₆ cycloalkyl, where the alkyl, the alkenyl, the alkynyl or the cycloalkyl may be optionally substituted with one or more R₆;

R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, C₁₋₆ alkyl, C₁₋₆ alkoxy and C₃₋₆ cycloalkyl, and may be optionally substituted with one or more R₇;

each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, CF₃, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈;

each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl; and

n is 0, 1, 2 or 3;

or a pharmaceutically acceptable salt or hydrate thereof.

In an embodiment of the present application, the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, is preferable, wherein:

X₁ is selected from O;

X₂ is selected from N or CH;

-   -   R₁ is selected from the group consisting of hydrogen, C₁₋₆         alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃₋₆ cycloalkyl, where the         alkyl, the alkenyl, the alkynyl or the cycloalkyl may be         optionally substituted with one or more R₆;

R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, C₁₋₆ alkyl, C₁₋₆ alkoxy and C₃₋₆ cycloalkyl, and may be optionally substituted with one or more R₇;

each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl;

each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, CF₃, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈;

each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃ haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆ cycloalkyl; and

n is 0, 1 or 2.

In an embodiment of the present application, the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, is preferable, wherein X₁ is O; R₁ is selected from C₁₋₆ alkyl, and may be optionally substituted with one or more R₆; and each R₆ is independently selected from the group consisting of hydroxy, phenyl and C₃₋₆ cycloalkyl. More preferably, R₁ is selected from the group consisting of methyl, ethyl, propyl and butyl, and may be optionally substituted with 1 or 2 R₆; and each R₆ is independently selected from the group consisting of hydroxy, phenyl and cyclopropyl.

In an embodiment of the present application, the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, is preferable, wherein X₁ is O; R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, methyl, ethyl, propyl, butyl, methoxy, ethoxy, propoxy and butoxy, and may be optionally substituted with 1 or 2 R₇; and each R₇ is independently selected from the group consisting of hydroxy, C₁₋₃ haloalkyl and C₁₋₆ alkyl. More preferably, R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, propyl, butyl and ethoxy, and may be optionally substituted with one or more R₇; and each R₇ is independently selected from hydroxy or trifluoromethyl.

In an embodiment of the present application, the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, is preferable, wherein X₁ is O; n is 0 or 1; and R₃ is C₁₋₃ haloalkyl. More preferably, n is 0 or 1, and R₃ is selected from trifluoromethyl.

In an embodiment of the present application, the following compounds are preferable:

or a pharmaceutically acceptable salts or hydrate thereof.

Pharmaceutically acceptable salts of the compound of formula I or the compound of formula II may refer to, for example, metal salts, ammonium salts, salts formed with organic bases, salts formed with inorganic acids, salts formed with organic acids, salts formed with basic or acidic amino acids, and the like. Non-limiting examples of the metal salts include, but are not limited to, alkaline metal salts, such as, sodium salts, potassium salts, and so on; alkaline earth metal salts, such as, calcium salts, magnesium salts and barium salts; aluminium salts, and the like. Non-limiting examples of the salts formed with organic bases include, but are not limited to, salts formed with trimethylamine, triethylamine, pyridine, methylpyridine, 2,6-dimethylpyridine, ethanolamine, diethanolamine, triethanolamine, cyclohexylamine, dicyclohexylamine, and the like. Non-limiting examples of the salts formed with inorganic acids include, but are not limited to, salts formed with hydrochloric acid, hydrobromic acid, nitric acid, sulfuric acid, phosphoric acid, and the like. Non-limiting examples of the salts formed with organic acids include, but are not limited to, salts formed with formic acid, acetic acid, trifluoroacetic acid, fumaric acid, oxalic acid, malic acid, maleic acid, tartaric acid, citric acid, succinic acid, methanesulfonic acid, benzenesulfonic acid, p-toluene sulfonic acid, and the like. Non-limiting examples of the salts formed with basic amino acids include, but are not limited to, salts formed with arginine, lysine, ornithine, and the like. Non-limiting examples of the salts formed with acidic amino acids include, but are not limited to, salts formed with aspartic acid, glutamic acid, and the like.

The pharmaceutically acceptable salts of the present application may be prepared from a parent compound containing an acidic or basic group through a conventional chemical method. In general, such salts may be prepared through the reaction of a compound in the form of a free acid or a free base with a stoichiometric appropriate base or acid in water, an organic solvent or a mixture of the both. Generally, a non-aqueous medium, such as, ether, ethyl acetate, ethanol, isopropanol, acetonitrile, and the like, is preferable.

The compound of formula I or the compound of formula II of the present application may exist in a non-solvated or solvated form, including a hydrate form. In general, the solvated form is equivalent to the non-solvated form, both of which are encompassed within the scope of the present application. The compound of formula I or the compound of formula II of the present application may exist in a polymorphic or amorphous form.

The compound of formula I or the compound of formula II of the present application may have an asymmetric carbon atom (optical center) or a double bond. Racemates, diastereomers, geometric isomers and individual isomers all are encompassed within the scope of the present application.

The graphic representations of racemic, ambiscalemic and scalemic, or enantiomerically pure compounds in the present application are derived from Maehr, J. Chem. Ed. 1985, 62: 114-120. Unless stated otherwise, solid and dashed wedges are used to denote the absolute configuration of a stereocenter. When the compound of formula I or the compound of formula II of the present application contains olefinic double bond(s) or other geometric asymmetric center(s), unless stated otherwise, E and Z geometric isomers are also encompassed. Likewise, all the tautomeric forms are also encompassed within the scope of the present application.

The compound of formula I or the compound of formula II of the present application may have special geometric or stereoisomeric forms. Such compounds, including cis- and trans-isomers, (−)- and (+)-enantiomers, (R)- and (S)-enantiomers, diastereomers, (D)-isomers, (L)-isomers, and a racemic mixture and other mixtures thereof, such as, enantiomerically or diastereoisomerically enriched mixtures, can be expected, all of which are encompassed within the scope of the present application. Additional asymmetric carbon atoms may exist in a substituent, such as alkyl and others. All these isomers and mixtures thereof are also encompassed within the scope of the present application.

Optically active (R)- and (S)-isomers and D and L isomers may be prepared by a chiral synthesis, or a chiral reagent, or other conventional techniques. If an enantiomer of a compound in the present application is desired, it may be prepared by an asymmetric synthesis or derivatization with a chiral auxiliary, in which the desired pure enantiomer is obtained by separating the resulting diastereomer mixture, and cleaving the auxiliary group. Alternatively, a molecule containing a basic functional group (such as, amino) or an acidic functional group (such as, carboxy) forms a diastereomeric salt with an appropriate acid or base having an optical activity, and then the diastereomeric resolution is performed with fractional crystallization or chromatography which is well-known to a person skilled in the art so as to recover a pure enantiomer. In addition, separation of enantiomers and diastereomers is usually carried out through chromatography that uses a chiral stationary phase, and is optionally combined with a chemical derivatization method (for example, forming carbamate from an amine).

The compound of formula I or the compound of formula II of the present application may contain an atomic isotope at a non-natural ratio at one or more atoms constituting said compound. For example, the compound may be isotopically labelled with radioisotopes, such as tritium (³H), iodine-125 (¹²⁵I) or carbon-14 (¹⁴C). All the isotopic variations of the compound of formula I or the compound of formula II of the present application, whether radioactive or not, are encompassed within the scope of the present application.

Pharmaceutical Composition

In an another aspect, the present application provides a pharmaceutical composition, comprising a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, and one or more pharmaceutically acceptable carriers or excipients. The pharmaceutical composition of the present application may further comprise one or more additional therapeutic agents.

The pharmaceutical composition of the present application may be prepared by combining the compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof of the present application, with appropriate pharmaceutically acceptable carriers or excipients. For example, the pharmaceutical composition of the present application may be formulated into solid, semi-solid, liquid or gaseous formulations, such as, tablets, pills, capsules, powders, granules, ointments, emulsions, suspensions, solutions, suppositories, injections, inhalants, gels, microspheres, aerosols, and the like.

Typical routes of the administration of the compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, or the pharmaceutical composition thereof of the present application include, but are not limited to, oral, rectal, transmucosal, enteral, or topical, transdermal, inhalation, parenteral, sublingual, intravaginal, intranasal, intraocular, intraperitoneal, intramuscular, subcutaneous, and intravenous administration.

The pharmaceutical composition of the present application may be manufactured by using a method well-known to a person skilled in the art, such as conventional mixing method, dissolution method, granulation method, dragee manufacture method, grinding method, emulsification method, lyophilization method, and the like.

For oral administration, the pharmaceutical composition may be prepared by mixing the compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, with pharmaceutically acceptable carriers or excipients well-known to a person skilled in the art. Such carriers or excipients enable the compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof of the present application, to be formulated into tablets, pills, lozenges, dragees, capsules, liquids, gels, slurries, suspensions, and the like, which are used for oral administration to a patient.

A solid oral pharmaceutical composition may be prepared by a conventional mixing, filling or tabletting method. For example, it may be obtained by mixing the compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt or hydrate thereof, with a solid excipient, optionally grinding the resulting mixture, if necessary, adding other appropriate auxiliaries, and then processing the mixture into granules to obtain the cores of a tablet or dragee. Appropriate auxiliaries include, but are not limited to, binders, diluents, disintegrating agents, lubricants, glidants, sweetening agents, flavoring agents, and the like, such as, microcrystalline cellulose, glucose solution, acacia mucilage, gelatin solution, sucrose and starch paste; talc, starch, magnesium stearate, calcium stearate, or stearic acid; lactose, sucrose, starch, mannitol, sorbitol, or dicalcium phosphate; silicon dioxide; cross-linked sodium carboxymethyl cellulose, pregelatinized starch, sodium starch glycollate, alginic acid, corn starch, potato starch, methyl cellulose, agar, carboxymethyl cellulose, cross-linked polyvinylpyrrolidone, and the like. The cores of a dragee may be optionally coated by using a generally well-known method in the pharmaceutical field, especially using an enteric coating.

The pharmaceutical composition of the present application may also be adapted for parenteral administration, such as, a sterile solution, a suspension or a lyophilized product in an appropriate unit dosage form. An appropriate excipient, such as a filler, a buffering agent, or a surfactant, may be used to formulate dosage forms suitable for parenteral administration.

Therapeutic Use

In an another aspect, the present application provides a method for treating IDH2 mutation-induced cancers, comprising administering to a subject in need thereof a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, or a pharmaceutical composition thereof.

In yet another aspect, the present application provides a use of a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, or a pharmaceutical composition thereof, in the preparation of a medicament for treating IDH2 mutation-induced cancers.

In yet another aspect, the present application provides a compound of formula I or a compound of formula II, or a pharmaceutically acceptable salt or hydrate thereof, or a pharmaceutical composition thereof, for use in the treatment of IDH2 mutation-induced cancers.

In some embodiments of the present application, the IDH2 mutation is an IDH2/R140Q mutation or an IDH2/R172K mutation.

In some embodiments of the present application, the IDH2 mutation-induced cancers are selected from the group consisting of glioblastoma (neuroglioma), myelodysplastic syndrome (MDS), myeloproliferative neoplasm (MPN), acute myelogenous leukemia (AML), sarcoma, melanoma, non-small cell lung cancer, chondrosarcoma, bile duct cancer and angioimmunoblastic non-Hodgkin's lymphoma (NHL). In more specific embodiments, the cancers to be treated are selected from the group consisting of neuroglioma, myelodysplastic syndrome (MDS), myeloproliferative neoplasm (MPN), acute myelogenous leukemia (AML), melanoma, chondrosarcoma, angioimmunoblastic non-Hodgkin's lymphoma (NHL), and the like, preferably including acute myelogenous leukemia (AML) or sarcoma.

The compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt thereof, or the pharmaceutical composition thereof of the present application may be administered through any suitable route and method, for example, through oral administration or parenteral administration (such as, intravenous administration). The compound of formula I or the compound of formula II, or the pharmaceutically acceptable salt thereof, or the pharmaceutical composition thereof of the present application may be administered to a subject in need thereof at a therapeutically effective amount. The compound of formula I or the compound of formula II is administered at a dosage of about 0.0001 to 20 mg/kg body weight/day, such as, about 0.001 to 10 mg/kg body weight/day.

The administration frequency of the compound of formula I or the compound formula II of the present application depends on the requirements of a patient subject, such as, once daily or twice daily, or more times daily. The administration may be intermittent. For example, a patient receives a daily dosage of the compound of formula I or the compound of formula II during a period of several days, but then does not receive a daily dosage of the compound of formula I or the compound of formula II during a period of several or more days.

Preparation

The compound of formula I or the compound of formula II of the present application can be prepared through various synthetic methods well-known to a person skilled in the art, including specific embodiments illustrated below, embodiments formed by a combination of such specific embodiments with other chemical synthetic methods, and equivalents well-known to a person skilled in the art. Preferable embodiments include, but are not limited to, the working Examples in the present application.

A chemical reaction in the specific embodiments of the present application is carried out in an appropriate solvent which should be suitable for the chemical change(s) and required reagent(s) and material(s) in the present application. In order to obtain the compound of formula I or the compound of formula II of the present application, a person skilled in the art sometimes needs to make a modification or selection to synthesis step(s) or reaction procedure(s) on the basis of the existing embodiments.

The compound of formula II of the present application may be prepared by a person skilled in the field of organic synthesis using a standard method through the following scheme:

A compound 1-2 is obtained through acylation of a compound 1-1; a compound 1-3 is obtained through a reaction of the compound 1-2 with biuret; a compound 1-4 is obtained through chlorination of the compound 1-3; a compound 1-5 is obtained through amination of the compound 1-4 with an amine substituted with R₂ group; and the compound of formula II is obtained through amination of the compound 1-5 with an amine substituted with R₂—X₁ group.

EXAMPLES

The following specific examples are provided to enable those skilled in the art to more clearly understand and practice the invention. They should not be construed as a limitation to the scope of the invention, but as mere illustrations and typical representatives of the invention. Those skilled in the art will understand that there are other synthetic routes involved for preparing the compounds of the present application, and ones provided below are non-limiting examples.

All operations involving raw materials that are susceptible to oxidation or hydrolysis are carried out under a nitrogen protection atmosphere. Unless indicated otherwise, raw materials used in the present application are commercially available and directly used without further purification.

Column chromatography was performed using silica gel (200-300 mesh) produced by Qingdao Chemical Co., Ltd. Thin Layer Chromatography was performed using prefabricated plates (silica gel 60 PF₂₅₄, 0.25 mm) manufactured by E. Merck. Separation of chiral compounds and measurement of enantiomeric excess (ee) were performed using the Agilent LC 1200 series (column: CHIRALPAK AD-H, 04.6×250 mm, 5 microns, 30° C.). NMR spectrum was performed using Varian VNMRS-400 nuclear magnetic resonance spectrometer; and LC/MS was performed using FINNIGAN Thermo LCQ Advantage MAX, Agilent LC 1200 series (column: Waters Symmetry C18, 04.6×50 mm, 5 micron, 35° C.), and ESI (+) ion mode.

Experiment Section

Example 1 4-(ethoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine

Step 1: Methyl 6-trifluoromethyl-pyridine-2-carboxylate

Under the protection of nitrogen gas, to a solution of 2-bromo-6-trifluoromethylpyridine (1.48 g, 6.55 mmol) in methanol (50.0 mL) were successively added palladium acetate (74.0 mg, 0.33 mmol), 1,1′-bis(diphenylphosphino)ferrocene (363.0 mg, 0.655 mmol) and triethylamine (0.92 g, 9.1 mmol), and reacted at a temperature of 60° C. for 18 hours under carbon monoxide atmosphere (2 atm). After the reaction was complete, the reaction solution was cooled to room temperature, and filtered. The filtrate was concentrated in vacuo, and the resulting residue was purified by column chromatography on silica gel to afford methyl 6-trifluoromethyl-pyridine-2-carboxylate (0.9 g, yield 67.0%).

Step 2: 6-(6-trifluoromethylpyridin-2-yl)-1,3,5-triazine-2,4(1H,3H)-dione

Under the protection of nitrogen gas, to a solution of sodium ethoxide (11.2 g, 165.0 mmol) in ethanol (200 mL) were successively added methyl 6-trifluoromethyl-pyridine-2-carboxylate (10.0 g, 48.7 mmol) and biuret (4.2 g, 40.7 mmol). The reaction mixture was heated at reflux for 2 hours, and then cooled to room temperature. The reaction solution was concentrated in vacuo, and the resulting residue was poured into water, and adjusted to pH 7 with 6 mol/L HCl solution. After the resulting solid was filtered, the filter cake was washed with water, and then dried to afford 6-(6-trifluoromethylpyridin-2-yl)-1,3,5-triazine-2,4(1H,3H)-dione (5.0 g, yield 47.5%).

Step 3: 2,4-dichloro-6-(6-trifluoromethylpyridin-2-yl)-1,3,5-triazine

Under the protection of nitrogen gas, a mixed solution of 6-(6-trifluoromethylpyridin-2-yl)-1,3,5-triazine-2,4(1H,3H)-dione (15.0 g, 58.1 mmol) and phosphorus oxychloride (200 mL) was reacted for 2 hours at a temperature of 100° C., and then cooled to room temperature. The reaction solution was concentrated in vacuo. The resulting residue was poured into a saturated aqueous solution of sodium bicarbonate, and extracted with ethyl acetate (2×100 ml). The organic phase was dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated in vacuo to afford 2,4-dichloro-6-(6-trifluoromethylpyridin-2-yl)-1,3,5-triazine (10.0 g, yield 58.3%).

Step 4: 4-chloro-6-(6-trifluoromethylpyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine

To a solution of 2,4-dichloro-6-(6-trifluoromethylpyridin-2-yl)-1,3,5-triazine (5.0 g, 16.9 mmol) in tetrahydrofuran (100 mL) were added 4-amino-2-trifluoromethyl pyridine (3.3 g, 20.3 mmol) and sodium bicarbonate (2.14 g, 25.3 mmol). The reaction mixture was reacted for 8 hours at a temperature of 70° C., and then cooled to room temperature. The reaction solution was concentrated in vacuo, and the resulting residue was purified by column chromatography on silica gel to afford 4-chloro-6-(6-trifluoromethylpyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine (6.5 g, yield 91.2%).

Step 5: 4-(ethoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine

To a solution of 4-chloro-6-(6-trifluoromethylpyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine (50.0 mg) in tetrahydrofuran (20 mL) were added ethoxyamine hydrochloride (12.0 mg, 0.12 mmol) and sodium bicarbonate (40.0 mg, 0.48 mmol). The reaction mixture was reacted for 8 hours at a temperature of 70° C., and then cooled to room temperature. The reaction solution was concentrated in vacuo, and the resulting residue was purified by column chromatography on silica gel to afford

4-(ethoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine (40.0 mg, yield 74.9%). ¹H-NMR (400 MHz, CDCl₃): δ=8.66-8.58 (m, 2H), 8.49 (s, 1H), 8.32 (s, 1H), 8.10 (t, J=7.9 Hz, 1H), 7.94 (s, 1H), 7.88 (d, J=7.8 Hz, 1H), 7.62 (d, J=3.7 Hz, 1H), 4.19 (q, J=7.0 Hz, 2H), 1.41 (t, J=7.1 Hz, 3H).

Example 2 4-(isopropylamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine

4-(isopropylamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=11.35 (s, 1H), 10.85 (s, 1H), 8.66 (s, 1H), 8.56 (d, J=5.6 Hz, 2H), 8.32 (t, J=7.9 Hz, 1H), 8.11 (d, J=7.6 Hz, 1H), 8.03 (s, 1H), 4.28-4.06 (m, 1H), 1.23 (d, J=14.5 Hz, 6H).

Example 3 4-(tert-butoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine

4-(tert-butoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=11.00 (s, 1H), 10.84 (s, 1H), 8.74 (s, 1H), 8.57 (t, J=6.5 Hz, 2H), 8.31 (t, J=7.9 Hz, 1H), 8.11 (d, J=7.7 Hz, 1H), 7.99 (s, 1H), 1.28 (s, 9H).

Example 4 4-((cyclopropylmethoxy)amino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine

4-((cyclopropylmethoxy)amino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=11.4 (s, 1H), 10.9 (s, 1H), 8.61 (s, 1H), 8.57 (d, J=5.6 Hz, 2H), 8.32 (t, J=7.9 Hz, 1H), 8.17-8.09 (m, 2H), 3.77 (d, J=7.1 Hz, 2H), 3.15 (d, J=5.2 Hz, 1H), 0.87-0.76 (m, 2H), 0.57-0.47 (m, 2H).

Example 5 N,N′-(6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2,4-diyl) bis(O-ethoxyamino)

N,N′-(6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2,4-diyl)bis(O-ethoxy amino) was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.96 (s, 2H), 8.48 (d, J=7.8 Hz, 1H), 8.24 (t, J=7.9 Hz, 1H), 8.04 (d, J=7.7 Hz, 1H), 3.90 (q, J=7.0 Hz, 4H), 1.30-1.06 (m, 6H).

Example 6 2-methyl-1-(((4-(6-(trifluoromethyl)pyridin-2-yl)-6-((2-(trifluoromethyl)pyridin-4-yl)amino)-1,3,5-triazin-2-yl)amino)oxy)propan-2-ol

2-methyl-1-(((4-(6-(trifluoromethyl)pyridin-2-yl)-6-((2-(trifluoromethyl) pyridin-4-yl)amino)-1,3,5-triazin-2-yl)amino)oxy)propan-2-ol was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, CDCl₃): δ=8.59 (dd, J=10.7, 6.7 Hz, 2H), 8.29 (s, 1H), 8.09 (t, J=7.8 Hz, 1H), 7.87 (d, J=7.8 Hz, 1H), 7.73 (s, 1H), 4.00 (s, 2H), 1.62 (s, 1H), 1.32 (s, 6H).

Example 7 2-methyl-2-(((4-(6-(trifluoromethyl)pyridin-2-yl)-6-((2-(trifluoromethyl)pyridin-4-yl)amino)-1,3,5-triazin-2-yl)amino)oxy)propan-1-ol

2-methyl-1-(((4-(6-(trifluoromethyl)pyridin-2-yl)-6-((2-(trifluoromethyl) pyridin-4-yl)amino)-1,3,5-triazin-2-yl)amino)oxy)propan-1-ol was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.80 (s, 1H), 8.54 (d, J=5.8 Hz, 1H), 8.29 (t, J=7.9 Hz, 3H), 8.08 (m, 2H), 5.38 (s, 1H), 4.56 (s, 1H), 3.54-3.39 (m, 2H), 1.27-1.10 (m, 6H).

Example 8 4-((benzyloxy)amino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine

4-((benzyloxy)amino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl)-pyridin-4-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=11.52 (s, 1H), 10.91 (s, 1H), 8.60 (s, 2H), 8.56 (d, J=5.4 Hz, 1H), 8.36 (t, J=7.9 Hz, 1H), 8.15 (d, J=7.7 Hz, 2H), 7.52 (s, 2H), 7.47-7.35 (m, 3H), 5.04 (s, 2H).

Example 9 4-(2-methylhydrazino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine

4-(2-methylhydrazino)-6-(6-(trifluoromethyl)pyridin-2-yl)-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.76 (s, 1H), 8.67 (s, 1H), 8.56 (d, J=5.5 Hz, 1H), 8.30 (t, J=7.9 Hz, 1H), 8.11 (d, J=7.7 Hz, 2H), 7.93 (s, 1H), 5.39 (s, 1H), 5.21 (s, 1H), 3.40 (s, 3H).

Example 10 4-(tert-butoxyamino)-6-phenyl-N-(2-(trifluoromethyl) pyridin-4-yl)-1,3,5-triazin-2-amine

4-(tert-butoxyamino)-6-phenyl-N-(2-(trifluoromethyl)pyridin-4-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.59 (d, 2H), 8.59 (m, 1H), 8.55 (m, 1H), 8.32 (m, 2H), 8.00 (m, 1H), 7.56 (m, 3H), 1.41-0.95 (m, 9H).

Example 11 1-((4-(tert-butoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2-yl)amino)-2-methylpropan-2-ol

1-((4-(tert-butoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2-yl) amino)-2-methylpropan-2-ol was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.29 (d, 2H), 8.53 (d, J=7.9 Hz, 1H), 8.28 (t, J=7.9 Hz, 1H), 8.13-8.03 (m, 1H), 4.86 (s, 1H), 3.39 (m, 2H), 1.27 (m, 9H), 1.07 (m, 6H).

Example 12 4-(tert-butoxyamino)-N-phenyl-6-(6-(trifluoromethyl) pyridin-2-yl)-1,3,5-triazin-2-amine

4-(tert-butoxyamino)-N-phenyl-6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.62 (s, 1H), 10.12 (s, 1H), 8.57 (d, J=7.9 Hz, 1H), 8.31 (t, J=7.8 Hz, 1H), 8.10 (d, J=7.2 Hz, 1H), 7.99 (m, 2H), 7.32 (t, J=7.9 Hz, 2H), 7.03 (t, J=7.4 Hz, 1H), 1.29 (s, 9H).

Example 13 N-benzyl-4-(tert-butoxyamino)-6-(6-(trifluoromethyl) pyridin-2-yl)-1,3,5-triazin-2-amine

N-benzyl-4-(tert-butoxyamino)-6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.26 (s, 2H), 8.50 (dd, J=13.2, 5.0 Hz, 2H), 8.33-8.18 (m, 1H), 8.05 (d, J=7.8 Hz, 1H), 7.37 (d, J=7.0 Hz, 1H), 7.31 (dd, J=10.1, 4.8 Hz, 2H), 7.22 (t, J=7.2 Hz, 1H), 4.55 (d, J=6.2 Hz, 2H), 1.18 (s, 9H).

Example 14 4-(tert-butoxyamino)-N-isopropyl-6-(6-(trifluoromethyl) pyridin-2-yl)-1,3,5-triazin-2-amine

4-(tert-butoxyamino)-N-isopropyl-6-(6-(trifluoromethyl)pyridin-2-yl)-1,3,5-triazin-2-amine was prepared referring to the synthetic method described in Example 1. ¹H-NMR (400 MHz, DMSO-d₆): δ=10.16 (s, 2H), 8.49 (d, J=8.1 Hz, 1H), 8.04 (d, J=7.4 Hz, 1H), 7.83 (d, J=7.9 Hz, 1H), 4.16 (m, 1H), 1.24 (m, 9H), 1.18 (m, 6H).

Experimental Example 1 Determining IDH2 Inhibitory Activity

The inhibitory activity of the compounds of the present application against IDH2 (R172K, 40-end) was determined by using the following method, which was expressed as IC₅₀ values, i.e., the concentrations of the compounds required to achieve 50% inhibition of IDH2 activity.

Materials and Methods:

The inhibitory activity of a compound against IDH2 (R172K, 40-end) was determined by the decrease of a helper factor NADPH. The test compound was pre-incubated with an enzyme and NADPH, and then a reaction was initiated by the addition of α-KG, and performed for 120 minutes under a linear condition. Then, the reaction was terminated by the addition of diaphorase (lipoamide dehydrogenase) and the corresponding substrate resazurin. Diaphorase terminated the IDH2m reaction by decreasing the available helper factor NADPH, which oxidized NADPH to NADP, and reduced resazurin to highly fluorescent resorufin. The amount of remaining helper factor NADPH after a specific reaction time was quantified via an easily detectable fluorophore.

Specifically, 2.5 μl of a 3-fold gradient diluted test compound was added to a 384-well plate, and then 5 μl of a reaction buffer (20 mM Tris-HCl, PH7.5; 150 mM NaCl; 10 mM MgCl2; 10 mM MnCl2; 0.4 mg/ml BSA and 2 mM DTT) containing 80 nM IDH2 (R172K, 40-end) and 40 μM NADPH was added. Then, the resulting test mixture was incubated for 120 minutes at a temperature of 23° C., and then 2.5 μl of the reaction buffer containing 4 mM α-KG was added to initiate the reaction. After incubating for 120 minutes at room temperature, 5 μl of a termination mixture (0.4 U/ml diaphorase and 40 μM resazurin) prepared with the reaction buffer was added to convert resazurin to resorufin to determine the remaining NADPH. After incubating for 10 minutes at a temperature of 23° C., a fluorescence value was determined through Flexstation 3 at Ex535/Em595.

The inhibitory activity of test compound against IDH2 was shown in Table 1.

TABLE 1 Example No. IC₅₀ (nM) 1 22.40 2 28.79 3 31.69 4 38.19 6 46.85 7 153.6 8 239.3 10 51.42

Experimental Example 2 Measuring Pharmacokinetics Parameters

The pharmacokinetic parameters of compounds of the present application were determined by using the following method.

Healthy male adult rats (7-9 weeks old) were used in this study. Each group of animals (3 male rats) was intragastrically administered once at a single dose of 5 mg/kg. The animals in the intragastric administration group were fasted overnight before this study. The fasting time period was from 10 hours before administration to 4 hours after administration.

Blood samples were taken at 0.25, 0.5, 1, 2, 4, 6, 8 and 24 h after administration. The animals were anesthetized with isoflurane using an animal anesthesia machine, and then 0.3 mL whole blood samples were taken from the fundus venous plexus. The blood samples were placed in heparin anticoagulant tubes, and centrifuged for 5 min at 4° C. and 4000 rpm. The resulting plasmas were transferred to centrifuge tubes, and stored at −80° C. until analysis.

Verified LC-MS/MS method was used to analyze the plasma samples. Plasma concentration-time data of animals were analyzed using WinNonlin (Professional Edition, version 6.3; Pharsight Company) software. The non-compartmental model was introduced for concentration analysis. The pharmacokinetic parameters of the compounds were calculated. As shown in Table 2, the compound in Example 3 had a better metabolism in vivo and a longer half-life, and had a higher plasma concentration than an IDH2 inhibitor AG-221 at the same dose.

TABLE 2 Example 3 AG-221 Dose (mg/kg) 5 5 T_(1/2) (hr) 12.0 3.73 T_(max) (hr) 5.0 4.00 C_(max) (ng/mL) 589 479 AUC_(0-inf) (hr*ng/mL) 10838 5385 

What is claimed is:
 1. A compound of formula II:

wherein: X₁ is selected from NH or O; X₂ is N; R₁ is selected from the group consisting of C₁₋₆ alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃₋₆cycloalkyl, wherein the alkyl, the alkenyl, the alkynyl or the cycloalkyl may be optionally substituted with one or more R₆; R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, C₁₋₆ alkyl, C₁₋₆alkoxy and C₃₋₆ cycloalkyl, and may be optionally substituted with one or more R₇; each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆cycloalkyl; each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃haloalkyl, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈; each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆cycloalkyl; and n is 0, 1, 2 or 3; or a pharmaceutically acceptable salt or hydrate thereof.
 2. The compound according to claim 1, wherein X₁ is selected from O; X₂ is N; R₁ is selected from the group consisting of C₁₋₆ alkyl, C₂₋₆ alkenyl, C₂₋₆ alkynyl and C₃-6cycloalkyl, wherein the alkyl, the alkenyl, the alkynyl or the cycloalkyl may be optionally substituted with one or more R₆; R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, C₁₋₆ alkyl, C₁₋₆ alkoxy and C₃₋₆cycloalkyl, and may be optionally substituted with one or more R₇; each R₃ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆cycloalkyl; each R₆ is independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃haloalkyl, C₁₋₆ alkyl, C₃₋₆ cycloalkyl, phenyl and 5- or 6-membered heteroaryl containing 1 or 2 heteroatoms selected from the group consisting of N, O and S, and the phenyl or the heteroaryl may be optionally substituted with one or more R₈; each R₇ and each R₈ are independently selected from the group consisting of halogen, hydroxy, amino, C₁₋₃haloalkyl, cyano, C₁₋₆ alkyl and C₃₋₆cycloalkyl; and n is 0, 1 or 2; or a pharmaceutically acceptable salt or hydrate thereof.
 3. The compound according to claim 1, wherein X₁ is O; R₁ is selected from C₁₋₆ alkyl, and optionally substituted with one or more R₆; and each R₆ is independently selected from the group consisting of hydroxy, phenyl and C₃₋₆ cycloalkyl; or a pharmaceutically acceptable salt or hydrate thereof.
 4. The compound according to claim 1, wherein X₁ is O; R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, methyl, ethyl, propyl, butyl, methoxy, ethoxy, propoxy, and butoxy, and optionally substituted with one or two R₇; and each R₇ is independently selected from the group consisting of hydroxy, C₁₋₃ haloalkyl, and C₁₋₆ alkyl; or a pharmaceutically acceptable salt or hydrate thereof.
 5. The compound according to claim 1, wherein X₁ is O; n is 0 or 1; and R₃ is C₁₋₃haloalkyl; or a pharmaceutically acceptable salt or hydrate thereof.
 6. The compound according to claim 1, wherein the compound is selected from the following compounds:

or a pharmaceutically acceptable salt and hydrate thereof.
 7. A pharmaceutical composition, comprising the compound according to claim 1, or a pharmaceutically acceptable salt or hydrate thereof, and one or more pharmaceutically acceptable carriers or excipients.
 8. A method for treating IDH2 mutation-induced cancers, comprising administering to a subject in need thereof the compound according to claim 1, or a pharmaceutically acceptable salt or hydrate thereof, wherein the IDH2 mutation is an IDH2/R140Q mutation or an IDH2/R172K mutation.
 9. The method according to claim 8, wherein the IDH2 mutation-induced cancers are selected from the group consisting of glioblastoma, myelodysplastic syndrome, myeloproliferative neoplasm, acute myelogenous leukemia, sarcoma, melanoma, non-small cell lung cancer, chondrosarcoma, bile duct cancer and angioimmunoblastic non-Hodgkin's lymphoma.
 10. A compound selected from the following:

or a pharmaceutically acceptable salt and hydrate thereof.
 11. The compound according to claim 1, wherein R₁ is selected from the group consisting of methyl, ethyl, propyl and butyl, and optionally substituted with one or two R₆; and each R₆ is independently selected from the group consisting of hydroxy, phenyl and cyclopropyl.
 12. The compound according to claim 1, wherein R₂ is selected from the group consisting of phenyl, pyridyl, benzyl, propyl, butyl and ethoxy, and optionally substituted with one or more R₇; and each R₇ is independently selected from hydroxy and trifluoromethyl.
 13. The compound according to claim 1, wherein n is 0 or 1, and R₃ is selected from trifluoromethyl.
 14. A method for treating IDH2 mutation-induced cancers, comprising administering to a subject in need thereof one or more of the compounds according to claim 10, or a pharmaceutically acceptable salt or hydrate thereof, wherein the IDH2 mutation is an IDH2/R140Q mutation or an IDH2/R172K mutation.
 15. The method according to claim 14, wherein the IDH2 mutation-induced cancers are selected from the group consisting of glioblastoma, myelodysplastic syndrome, myeloproliferative neoplasm, acute myelogenous leukemia, sarcoma, melanoma, non-small cell lung cancer, chondrosarcoma, bile duct cancer, and angioimmunoblastic non-Hodgkin's lymphoma. 